Multilayer Etch Stop Layer for Semiconductor Device Patterning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in semiconductor device manufacturing is to improve electrical characteristics and simplify the manufacturing process while reducing process difficulty, particularly in integrating resistive elements effectively.
Innovation Solution
A semiconductor device design that includes a substrate with distinct regions for active and dummy gate structures, source/drain elements, conductive contacts, and a resistive structure, utilizing a multilayer etch stop layer to prevent interface failures and damage during the patterning process, allowing for improved integration and electrical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer etch stop layer is used, then the manufacturing process is simpler, but damage to conductive contacts and interface failures occur during patterning
Solution Approach 1:
The etch stop layer is divided into multiple layers with different materials and etch selectivities. The lower etch stop layer (first material) and upper etch stop layer (second material) are segmented to provide different protection functions during wet and dry etching processes, preventing interface failures and contact damage while maintaining manufacturing feasibility
Solution Approach 2:
The multilayer etch stop structure acts as an intermediary between the substrate and the resistive structure, providing graduated protection during patterning. Each layer mediates the etching process differently, with the lower layer protecting during wet etching and the upper layer protecting during dry etching, thereby preventing direct damage to conductive contacts
2Productivity
If device size is reduced to increase integration density, then more devices fit per unit area, but manufacturing precision and electrical characteristics deteriorate
Solution Approach 1:
The etch stop layer is segmented into multiple thin layers rather than one thick layer, allowing for better control of etching depth and precision. This segmentation enables accurate patterning of small-scale devices while maintaining the required manufacturing precision through selective etching of each layer
Solution Approach 2:
The patent changes the material parameters of the etch stop layer by using different materials with different etch selectivities for different layers. This parameter change allows precise control over the etching process at reduced device dimensions, maintaining manufacturing precision even as device size decreases
3Ease of manufacture
If process steps are simplified, then manufacturing is easier, but electrical characteristics and device performance worsen
Solution Approach 1:
The multilayer etch stop structure combines multiple protective functions into a single integrated component that is formed during the normal manufacturing flow. By merging the protection against wet etching and dry etching into one etch stop layer structure, the patent improves electrical characteristics without adding significant process complexity
Solution Approach 2:
The etch stop layer structure serves multiple protective functions automatically during the patterning process. The different materials in the lower and upper layers self-adjust to provide appropriate protection during wet and dry etching respectively, improving device performance without requiring additional manual intervention or complex process steps
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances electrical characteristics and manufacturing efficiency by preventing damage to conductive contacts and ensuring accurate patterning, thereby improving the integration of resistive elements within the semiconductor device.
Implementation Method 1
an etch stop layer between the dummy gate structure and the resistive structure. The etch stop layer includes a lower etch stop layer and an upper etch stop layer
Data Source
AI summary
A semiconductor device includes a substrate including a first region and a second region, an active gate structure on the substrate in the first region, a dummy gate structure on the substrate in the second region, a source/drain on the substrate in the first region at each of opposite sides of the active gate structure, a plurality of first conductive contacts respectively connected to the active gate structure and the source/drain, a resistive structure on the dummy gate structure in the second region, a plurality of second conductive contacts respectively connected to the plurality of first conductive contacts and the resistive structure, and an etch stop layer between the dummy gate structure and the resistive structure. The etch stop layer includes a lower etch stop layer and an upper etch stop layer, which are formed of different materials.